diff --git a/ci/fireci/fireciplugins/binary_size.py b/ci/fireci/fireciplugins/binary_size.py
index 6f966a3bfd7..ddb97c3f939 100644
--- a/ci/fireci/fireciplugins/binary_size.py
+++ b/ci/fireci/fireciplugins/binary_size.py
@@ -55,6 +55,13 @@ def binary_size(pull_request, log, metrics_service_url, access_token):
   affected_artifacts, all_artifacts = _parse_artifacts()
   artifacts = affected_artifacts if pull_request else all_artifacts
   sdks = ','.join(artifacts)
+  if not sdks:
+    _logger.info(
+      "No sdks found whose binary size to measure ("
+      "pull_request=%s affected_artifacts=%s all_artifacts=%s)",
+      pull_request, affected_artifacts, all_artifacts
+    )
+    return
 
   workdir = 'health-metrics/apk-size'
   process = gradle.run('assemble', '--continue', gradle.P('sdks', sdks), workdir=workdir, check=False)
diff --git a/health-metrics/apk-size/app/configure.gradle b/health-metrics/apk-size/app/configure.gradle
index 1efea2b8180..1e559241a77 100644
--- a/health-metrics/apk-size/app/configure.gradle
+++ b/health-metrics/apk-size/app/configure.gradle
@@ -24,7 +24,14 @@ repositories {
 if (project.hasProperty('sdks')) {
     project.android {
         sdks.split(',').each { sdk ->
-            def (groupId, artifactId, version) = sdk.split(':')
+            def sdkParts = sdk.split(':')
+            if (sdkParts.size() != 3) {
+                throw new GradleException(
+                    "Invalid SDK format: '${sdk}'. " +
+                    "Expected format: 'groupId:artifactId:version' (sdks: '${sdks}')"
+                )
+            }
+            def (groupId, artifactId, version) = sdkParts
             productFlavors.create(artifactId) {
                 dimension 'firebase'
             }